Stock Photo - VIENNA - SEPTEMBER 9: Metro station and ticket machines on September 9, 2011 in Vienna. With 534m annual passengers (2010), Vienna's U-Bahn is 20th largest metro system worldwide.

VIENNA - SEPTEMBER 9: Metro station and ticket machines on September 9, 2011 in Vienna. With 534m annual passengers (2010), Vienna's U-Bahn is 20th largest metro system worldwide.

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